Piston-ring



J. AREND.

PISTON RING.

APPLICATION FILED JULY 29, I920.

1,391,816. 7 Paten e sept. 27,1921.

PATENT OFFICE.

JOHN AREND, OF MANKATO, MINNESOTA.

PISTON-RING.

Specification of Letters Patent. Patented Sept. 27, '1921.

Application filed J'uly 29, 1920. Serial No. 399,846.

' of the United States of America, and resident of Mankato, in thecounty of Blue Earth and State of Minnesota, have invented. certain newand useful Improvements in Piston-Rings, of which the following is a vspecification.

This invention relates to piston or packing rings for internalcombustion motors, the said invention having for its object theprovision of a sectional packing ring the sections of which areoperative to cause close engagement with the walls of the ring groove inpiston at the top and bottom of the ring while at the same time itinsures a close fit between the piston ring and the cylinder wall; thesaid invention also hav ing for its object the production of a ring ofthis character the sections of which are under tension at all times witha force tending to separate the upper and lower ring sections so thatthere is no liability of the rings becoming bound together or renderedinactive due to deposits of carbon, and the sections of the ring are sooperated as to cause them to spread to take up end play or lost motiondue to wear. 7 y

The main object of this invention is to produce a ring that willautomatically adjust itself to the width of the ring groove,

if same is worn, and also to prevent any being cut away allows the oilto pass the lower section of the ring on the up stroke of the piston.The cavity which carries the oil downward is formed by cutting oil aportion of the inner and lower section of the ring; therefore, the innerwalls of the cavity I are not stationary as they would be if cavity werecut inthe face of a one-piece ring. Either one of the sections of thering chang ing its position by turning in the ring groove would have atendency to break up any carbon in the cavity and prevent same frombaking the ring in the groove. This ring being a combination compressionand oil ring, the use of same would do away with the necessity ofusingtwo styles of rings on the same piston. Fewer rings can be used perpiston.

With the foregoing and other objects in view, the invention consists inthe details of construction, and in the arrangement and combination ofparts to be hereinafter more fully set forth and claimed.

In describing the invention in detail, reference will be had to theaccompanying drawings forming part of this specification wherein likecharacters denote corresponding parts in the several views, and in whichFigure 1 illustrates a view in elevation .partly in section of a pistonhaving piston rings embodying the thereto;

Fig. 2 illustrates a perspective view collectively of the sections ofthe ring, and

Fig. 3 illustrates an enlarged detailed sectional view of the ring inits assembled position.

In these drawings, 5 denotes a fragment of a piston, 6 the centralsection "of" the piston ring, which, with the companion sections 7 and8, very nearly fill the groove of the piston ring. The member 6 is atruncated V-shaped member, the base of which lies in close proximity,and in fact, nearly touches or is intended to nearly touch the wall ofthe groove.

The member 7 has its lower side straight to fit against the groove inthe'piston, and the upper side is beveled to the contour of inventionapplied the lower edge of the section 6. The edge I of the member 7 isbeveled or cut away as at 11 with a downward bevel when the piston isoperating vertically, the said cutaway portion being intended to producea clearance for the reception of surplus oil from the cylinder wallwhile the piston is reciprocating, and this oil is prevented fromgaining access to th combustion chamber where it would foul the sparkplugs and increase carbon deposits.

The section 8 of the ring has its upper surface or edge straight to fitagainst the groove in the piston and its lower edge 10 is beveled to thecontour of the upper surface of the section 6 of the ring. The upperring section has its outer face and its lower beveled face intersectingto form an undisturbed edge 13 which acts as a scraper to remove surplusoil which may be present on the walls of the cylinder to which the ringsare applied, whereas there is sufiicient clearance between the inneredge of the member 7 and the inner edge of the member 8 to permit themember 6 to act on them to force them outwardly and apart so that theywill be in close contact with the walls ofthe cylinder.

By reason of the cross sectional area of the member 6 which isrelatively large, the sections of the ring may be made of cast metal andthey need not be madeof highly resilient material which so quickly losesits value as a ring producing metal.

The outer edge of the member 6 is well back of the line of contact ofthe outer surfaces of the members 7 and 8, and the size of the cavitymay be increased or diminished according to the amount of material whichis removed'or admitted from the outer edge of the said member 6, but theproportions shown in Fig. 3 are believed to be illustrative of the mostsatisfactory means of carrying the invention into practice.

I claim:

1. In a piston ring, a series of coacting ring sections comprising acentral ring having its top and bottom walls converging outwardly andterminating short of the point of intersection, an upper ring sectionhaving an upperstraight side and beveled lower side conformingapproximately to the bevel of the central section and having its outerface and beveled edge intersecting to produce an angular lower edge, alower ring section having a straight lower side and a beveled upper sidecoactlng with the beveled side of the middle section, and having itsouter upper edge downwardly beveled.

2. In a piston ring, a central section having converging upper and lowersides terminating short of the point of intersection and having astraight outer wall, a ring section on the side of the central sectionnearest the combustion chamber of the cylinder to which the piston isapplied and having its outer edge remote from the combustion chamberformed at an acute angle and a coacting ring section beveled to thecontour of the first mentioned section on the side remote from thecombustion chamber, whose beveled edge and cylinder contacting surfaceare intersected. by a beveled portion inclined from the combustionchamber, as and for th purpose described.

JOHN AREND.

